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D( x )
x = 0
cos(65) = 0
x = 0
x = 0
cos(65) = 0
cos(65) = 0
t_1 = cos(65)
cos(65) = 0
t_1 = 0
x należy do R
x in (-oo:+oo)
x belongs to the empty set
tan(65) = 7/x
x belongs to the empty set
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